Sash cord rope repairs and spiral balance replacement in timber or aluminium frames. One single window or an entire apartment block. As an example only, to replace all four cords on both upper and lower panes of a double hung sash window, lubricate all moving parts and replace loose putty can cost as little as $350.00 plus GST To replace two spiral balances in a timber frame - $185 plus taxes or an aluminium sash frame - $200.00 plus taxes. Discounts apply for multiple windows. Check us out further at http://www.sashwindowrepair.com.au